Use the 'at' argument to boxplot. E.g., > x <- rep(c(2,4,8,16), c(5,10,20,30)) > y <- seq_along(x) > par(mfrow=c(2,1)) > boxplot(y~x, at=unique(x)) > boxplot(y~x)
Bill Dunlap TIBCO Software wdunlap tibco.com On Fri, Sep 28, 2018 at 3:05 AM, Luigi Marongiu <marongiu.lu...@gmail.com> wrote: > Dear all, > I am using boxplot to draw some data. Would be possible to have the > X-axis linear (as in a scatter plot) instead of the standard > categorical axis? > The data I have is subdivided into three groups at the numerical > values 1, 3, 5; boxplot treats these as categorical values; in fact, I > can write my own labels simply by using the values 1, 2, 3 for the > position of the labels as in the example. > Thank you, > > >>>> > # generate data.frames > A = c(70, 22, 4, 21, 29, 35, 24, 20, 9, 21, > 22, 12, 20, 21, 13, 18, 15, 3, 9, 23, > 6, 5, 2, 24, 25, 21, 16, 0, 4, 1) > B = c(17, 21, 70, 6, 23, 10, 8, 5, 22, 5, > 21, 5, 19, 9, 23, 24, 11, 13, 7, 15, > 25, 9, 13, 14, 11, 9, 12, 0, 5, 9) > C = c(17, 8, 30, 22, 11, 32, 33, 8, 160, 11, > 35, 7, 36, 15, 11, 25, 16, 6, 38, 19, > 35, 30, 12, 27, 22, 32, 47, 39, 31, 26) > X = rep(c(1, 3, 5),30*3) > dfA <- data.frame(X, c(A, B, C)) > names(dfA) <- c("X", "Y") > par(mfrow=c(2,1)) > boxplot(dfA$Y ~ dfA$X, > ylim=c(0, 80), > col="green", > ylab="Y-values", > xlab="X-values", > main="usual X labels" > ) > boxplot(dfA$Y ~ dfA$X, > ylim=c(0, 80), > col="green", > ylab="Y-values", > xlab="X-values", > main="custom X labels", > xaxt="n" > ) > x.lab = c("A", "B", "C") > x.pos = c(1, 2, 3) > axis(side=1, at=x.pos, > lab=x.lab, cex.axis=1) > > -- > Best regards, > Luigi > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/ > posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.